It is not unknown that the movement of the child is necessary. Precisely because of the increasing modernization of the times in which we live, apropos, an increasingly sedentary lifestyle, it is necessary to encourage movement from an early age and let the child know how important physical activity is. Children, in the period before preschool, spend their physical activities mainly through play. It is precisely the period of preschool and early school age when the child turns to some more serious physical activity. However, in order to direct a child to the right sport, it is necessary to find out what suits him best. That is exactly why there are educators and teachers who should recognize the potential of the children they work with. In order to recognize and be able to direct the child further in life, it is necessary to have a good knowledge of his kinanthropological characteristics, morphological characteristics, his motor skills and functional ability. In addition to the observation method, the kinanthropological characteristics of children and students can be assessed by applying appropriate batteries of tests, and in accordance with the pretensions of individual abilities, they can be directed to the appropriate activity. This is exactly the topic of this thesis. The topic itself will be introduced through the definitions of physical activity and physical fitness, it will be written about what the aforementioned includes, kinanthropological features will be analyzed, and the most common tests that are used to measure. Then the battery of tests, or their primary features, will be listed. Finally, the table will analyze the key components of each test that are used all over the world to assess the physical fitness of preschool and early school-age children.